build: cache dependencies + skip duplicate runs

.github/workflows/test.yml

@@ -10,8 +10,21 @@ env:
  CI: true
 
 jobs:
+ skip-duplicate-runs:
+ runs-on: ubuntu-latest
+ outputs:
+ should_skip: ${{ steps.skip_check.outputs.should_skip }}
+ steps:
+ - id: skip_check
+ uses: fkirc/skip-duplicate-actions@ea548f2a2a08c55dcb111418ca62181f7887e297
+ with:
+ concurrent_skipping: 'same_content'
+ paths_ignore: '["**/*.md"]'
+
  test:
- name: "node v${{ matrix.node-version }} on ${{ matrix.os }}"
+ needs: skip-duplicate-runs
+ if: ${{ needs.skip-duplicate-runs.outputs.should_skip != 'true' }}
+ name: 'node v${{ matrix.node-version }} on ${{ matrix.os }}'
  runs-on: ${{ matrix.os }}
 
  strategy:
@@ -28,8 +41,20 @@ jobs:
  with:
  node-version: ${{ matrix.node-version }}
 
+ - name: get cache directory
+ id: get-yarn-cache
+ run: echo "::set-output name=dir::$(yarn cache dir)" # XXX don't single quote
+
+ - name: restore cache directory
+ id: restore-yarn-cache
+ uses: actions/cache@v2
+ with:
+ path: ${{ steps.get-yarn-cache.outputs.dir }}
+ key: ${{ matrix.os }}-yarn-${{ hashFiles('yarn.lock') }}
+ restore-keys: ${{ matrix.os }}-yarn-
+
  - name: install
- run: yarn install --prefer-offline
+ run: yarn install --prefer-offline --frozen-lockfile
 
  - name: test
  run: yarn test